Whitney Houston's daughter had drugs with her when she passed out in bath: reports

The daughter of Whitney Houston fighting for her life in a medically-induced coma reportedly had drugs with her when she passed out in a bath while another man present was a convicted drug dealer.

Bobbi Kristina Brown, 21, was found by husband Nick Gordon face down in a bathtub in her Atlanta home on Saturday.

Family members confirmed a second search of Brown's home found drugs, although what exactly was found remains unclear and this is yet to be confirmed by police, TMZ reports.

A longtime friend of Gordon's, Maxwell Lomas, who performed CPR on Brown along with Gordon, was arrested last month and charged with possession of marijuana with intent to distribute and unlawful possession of guns.

Brown has been placed in a medically induced coma to address swelling on the brain and is breathing through a ventilator, TMZ reports.

Brown with husband Nick Gordon. (Getty)

Brown's hospitalisation comes just days before the three-year anniversary of the death of Houston, who died in eerily similar circumstances to how Brown was found.

Houston was found dead in a hotel bathtub in Beverly Hills, California, after taking a deadly cocktail of cocaine and prescription sedatives.

A friend of Brown’s, Sammy Tawill, said the next few days would be crucial.

"I think the next 24 to 48 hours, we hopefully will hear some good news and better news. She’s a fighter, she’s definitely a fighter. She’s a tough little girl.

Kevin Costner. (Getty)

Actor Kevin Costner, who starred alongside Houston in 1992 film The Bodyguard, said he was sad to hear the reports.

"That family’s under a lot of stress right now, just an enormous amount of stress," Costner told People.

Whitney Houston performing in 1988. (Getty)

"I can’t imagine … I really hope she’s okay."

Apart from her connection with her late mother, known for such hits as I Wanna Dance With Somebody and I Will Always Love You, Brown is best known for starring in reality television series Being Bobby Brown.

She is said to have hoped to follow in the footsteps of her late mother and break into the music industry, but like Houston, had long publicly battled with drug addiction.